#include <stdio.h>
int main()
{
int units;
float bill;
if (units <= 200)
bill = 0;
else if (units <= 400)
bill = (units - 200) * 5;
else if (units <= 600)
bill = 200 * 5 + (units - 400) * 7;
else if (units <= 800)
bill = 200 * 5 + 200 * 7 + (units - 600) * 9;
else
bill = 200 * 5 + 200 * 7 + 200 * 9 + (units - 800) * 11;
printf("electricity bill = %.0f rs", bill
);
return 0;
}
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